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Design and experiment of fuzzy-PID based tillage depth control system for a self-propelled electric tiller

International Journal of Agricultural and Biological Engineering 2023年第4期16卷 116-125页

作者： Maohua Xiao Ye Ma Chen Wang Junyun Chen Yejun Zhu Petr Bartos Guosheng Geng College of Engineering Nanjing Agricultural UniversityNanjing 210031China Faculty of Agriculture University of South BohemiaStudentska 1668Czech

The research on the self-propelled electric tiller is vital for further improving the quality and efficiency of greenhouse rotary tillage operation,reducing the work intensity and operation risk of operators,and achieving environmentally friendly *** of the existing self-propelled tillers rely on manual adjustment of the tillage ***,the consistency and stability of the tillage depth are difficult to *** this study,the automatic control method of tillage depth of a self-propelled electric tiller is investigated.A method of applying the fuzzy PID(Proportional Integral Derivative)control method to the tillage depth adjustment system of a tiller is also proposed to realize automatic *** system uses the real-time detection of the resistance sensor and angle *** controller runs the electronically controlled hydraulic system to adjust the force and position *** fuzzy control algorithm is used in the operation error control to realize the double-parameter control of the tillage *** simulation and experimental verification of the system are *** show that the control system applying fuzzy PID can improve the soil breaking rate by 3%in the operation process based on reducing the stability variation of tillage depth by 24%.The control strategy can reach the set value of tillage depth quickly and *** can also meet the requirement of tillage depth consistency during the operation.

关键词： Fuzzy PID Self-propelled electric tiller tillage depth Electro-controlled hydraulic system Comprehensive adjustment of force and position

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Effects of tillage depth on Nutrients and Microbial Communities in Tobacco-Planting Soil

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Agricultural Sciences 2023年第12期14卷 1702-1715页

作者： Guanxing Shang Qibo Zou Jiamei Zhang Jing Wang Yuanbo Zhang Mingchang Liu Shihai Wang Dan Zhang Wei Wang Yiming Wang Liupanshui Branch of Guizhou Tobacco Company Liupanshui China Institute of Soil Science Chinese Academy of Sciences Nanjing China

The implementation of appropriate tillage practices is of great significance for agricultural production. However, the effects of different tillage depths on soil nutrients content and microbial communities in tobacco-planting soils are still lacking systematic research. In this study, three different tillage depths of 15 cm (T1), 20 cm (T2), and 30 cm (T3) were set up for field experiments in Liupanshui, Guizhou Province, to explore the effects of tillage depth on tobacco-planting soil nutrients and bacterial and fungal communities based on 16S rRNA and ITS sequencing and figure out the key factors affecting soil microbial communities. The results showed that T2 and T3 increased the contents of organic matter, total nitrogen, total phosphorus, available phosphorus, and available potassium in tobacco-planting soil, and increased the diversity of bacterial communities compared with T1. There was no significant difference in the structure of bacterial and fungal communities in different tillage depth treatments, but some dominant genera were significantly enriched in T2 and T3. Desulfobacter, Setophoma, Humicola, and Acremonium were significantly enriched in T2. Chthonomonas and Fusarium were significantly enriched in T3. These genera favor the decomposition of organic matter and the cycling of nutrients, and control soil pests and diseases. Redundancy analysis indicated that TP and AK were the key factors influencing the dominant genera of bacteria and fungi. This study provides a scientific basis for the selection of soil tillage depth for tobacco production in this region.

关键词： tillage depth Tobacco Soil Nutrients Bacterial Community Fungal Community

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Characteristics of greenhouse gas emissions from rice paddy fields in South Korea under climate change scenario RCP-8.5 using the DNDC model

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Pedosphere 2021年第2期31卷 332-341页

作者： Wonjae HWANG Chanyang KIM Kijong CHO Seunghun HYUN Department of Environmental Science and Ecological Engineering Korea UniversitySeoul 02841(South Korea)

Understanding the greenhouse gas(GHG)emission from rice paddy fields is essential to come up with appropriate countermeasure in response to global ***,GHG emissions from paddy fields in South Korea are not well *** objectives of this study were to estimate the carbon dioxide(CO_(2))and methane(CH_(4))emissions from rice paddy fields in South Korea,under the Representative Concentration Pathway 8.5(RCP-8.5)climate change scenario using the DNDC(i.e.,DeNitrification-DeComposition)model at 1-km^(2)*** performance of the model was verified with field data collected using a closed chamber,which supports the application of the model to South *** the model predictions and field measurements showed that most(>95%)GHG emissions occur in the cropping period,between April and *** a baseline(assuming no climate change),the national sums of the CO_(2)and CH_(4)emissions for the 2020 s and 2090 s were estimated to be 5.8×10^(6)and 6.0×10^(6)t CO_(2)-equivalents(CO_(2)-eq)year^(-1)for CO_(2)and 6.4×10^(6)and 6.6×10^(6)t CO_(2)-eq year^(-1)for CH_(4),respectively,indicating no significant changes over 80 *** RCP-8.5,in the 2090 s,CH_(4)emissions were predicted to increase by 10.7×10^(6)and 14.9×10^(6)t CO_(2)-eq year^(-1),for a 10-or 30-cm tillage depth,***,the CO_(2)emissions gradually decreased with rising temperatures,due to reduced root *** tillage increased the emissions of both GHGs,with a more pronounced effect for CH_(4)than CO_(2).Intermittent drainage in the middle of the cropping season can attenuate the CH_(4)emissions from paddy *** findings of this work will aid in developing nationwide policies on agricultural land management in the face of climate change.

关键词： CH_(4) CO_(2) model performance paddy soil rising temperature tillage depth

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